I first noticed listening to "Speed Of Light", that the "solo" (and then the sound at the very end) is really very high-pitched and much more like guitar sound than sound that anyone is able to produce by mouth...

I first noticed listening to "Speed Of Light", that the "solo" (and then the sound at the very end) is really very high-pitched and much more like guitar sound than sound that anyone is able to produce by mouth...

They play with the sound in the studio with some amps and stuff to make it sound more guitar-ish, but it's all strictly vocal work. Except that one guest performance at the latest album, by Victor Smolski I think.